Remote monitoring of seismic swarms and the August 2016 seismic crisis of Brava, Cabo Verde, using array methods

  • During the first two days of August 2016 a seismic crisis occurred on Brava, Cabo Verde, which – according to observations based on a local seismic network – was characterized by more than a thousand volcano-seismic signals. Brava is considered an active volcanic island, although it has not experienced any historic eruptions. Seismicity significantly exceeded the usual level during the crisis. We report on results based on data from a temporary seismic-array deployment on the neighbouring island of Fogo at a distance of about 35 km. The array was in operation from October 2015 to December 2016 and recorded a total of 1343 earthquakes in the region of Fogo and Brava; 355 thereof were localized. On 1 and 2 August we observed 54 earthquakes, 25 of which could be located beneath Brava. We further evaluate the observations with regards to possible precursors to the crisis and its continuation. Our analysis shows a significant variation in seismicity around Brava, but no distinct precursory pattern. However, the observations suggest that similar earthquake swarms commonly occur close to Brava. The results further confirm the advantages of seismic arrays as tools for the remote monitoring of regions with limited station coverage or access.
Author:Carola Leva, Georg RümpkerORCiD, Ingo Wölbern
Parent Title (English):Natural hazards and earth system sciences : NHESS
Place of publication:Göttingen
Document Type:Article
Date of Publication (online):2020/12/23
Date of first Publication:2020/12/23
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2021/01/21
Page Number:12
First Page:3627
Last Page:3638
© Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
Institutes:Geowissenschaften / Geographie / Geowissenschaften
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 55 Geowissenschaften, Geologie / 550 Geowissenschaften
Open-Access-Publikationsfonds:Geowissenschaften / Geographie
Licence (German):License LogoCreative Commons - Namensnennung 4.0